The mold cleaning product I have used the most, with good results, is white distilled vinegar. The EPA does not recommend using bleach, except in special cases where the resident is immune compromised.  Vinegar will take care of most molds and prevent them from returning. Bleach only kills the mold on the surface.  It will return, and the mold will also embed itself deeper into the porous surface. White vinegar has 5% acidity. You can also use “cleaning vinegar” which just as a slightly higher acidity level, at 6%.